<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>class选择器</title>
		<style>
			.d{
				color:greenyellow;
				font-size: 80px;
			}
		</style>
	</head>
	<body>
		<h2>态度决定一切</h2>
		<h2 class="d">气度决定成就</h2>
		<h2>温度决定杨梅扬</h2>
	</body>
</html>